According to surveillance video from the Midwest City, OK, Walmart, Sammie Wallace grabbed a toddler from a shopping cart and held a knife to her throat for no apparent reason. Law enforcement quickly evacuated the store and tried to negotiate with Wallace, who has a history of mental illness and a violent arrest record. But when he threatened to kill the girl in 60 seconds, police took action, shooting Wallace in the head.

"Obviously, our goal was to talk him down to get him to release the child," Midwest City Police Chief Brandon Clabes said. "Unfortunately, we weren't successful but we were successful in saving this child."

The toddler was uninjured in the shooting and was returned to her mother.